deletions | additions       diff --git a/The_recent_measurement_cite_Cantero_2009__.tex b/The_recent_measurement_cite_Cantero_2009__.tex  index dd2a812..cbd9a16 100644  --- a/The_recent_measurement_cite_Cantero_2009__.tex  +++ b/The_recent_measurement_cite_Cantero_2009__.tex 
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The recent measurement \cite{Cantero_2009} by slow ($v > 0.1~\mathrm{a.u.}$)  $\mathrm{H^+}$ in $\mathrm{Cu}$ reveals the stopping due to conduction band electronic excitation at lower velocity. The combined effects of both the free electrons and the loosely bound $d$ electrons causes a change of the slope. slope\cite{Goebl_2013}.  This study supports this even down to $v = 0.01 ~\mathrm{a.u.}$ (see Figure \ref{fig:log_stopping_power}). The experimental results of Nomura and Kiyota \cite{Nomura_1975} on $\mathrm{H^+ + Cu}$ film show the dependence of $S_\text{e}$ on incident velocity agrees with the calculation of Lindhard {\emph et al} \cite{Lindhard_Scharff_Schiott}. In the low energy region the energy loss in metal is due to the excitation of a portion of electrons around the Fermi level to empty states in the conducting band. But at higher energies, a minimum momentum transfer of the projectile is possible due to its short duration close to the target. In this region the electronic curve has a maximum due to the limited response time of target electrons to the projectile ions. In this paper we concentrate in the intermediate regime.  We report here an application of the TDDFT that embodies a plane-wave basis set that represents accurately the electron dynamics \cite{Correa_2012,Schleife_2012,Schleife_2014} for proton impact collision of $\mathrm{Cu}$ crystal. The suitability of this method is tested by evaluating the $S_\text{e}$.